Inbreeding depression is high in a self-incompatible perennial herb population but absent in a self-compatible population showing mixed mating

Ecology and Evolution
Marie Voillemot, John R Pannell

Abstract

High inbreeding depression is thought to be one of the major factors preventing evolutionary transitions in hermaphroditic plants from self-incompatibility (SI) and outcrossing toward self-compatibility (SC) and selfing. However, when selfing does evolve, inbreeding depression can be quickly purged, allowing the evolution of complete self-fertilization. In contrast, populations that show intermediate selfing rates (a mixed-mating system) typically show levels of inbreeding depression similar to those in outcrossing species, suggesting that selection against inbreeding might be responsible for preventing the transition toward complete self-fertilization. By implication, crosses among populations should reveal patterns of heterosis for mixed-mating populations that are similar to those expected for outcrossing populations. Using hand-pollination crosses, we compared levels of inbreeding depression and heterosis between populations of Linaria cavanillesii (Plantaginaceae), a perennial herb showing contrasting mating systems. The SI population showed high inbreeding depression, whereas the SC population displaying mixed mating showed no inbreeding depression. In contrast, we found that heterosis based on between-population crosses ...Continue Reading

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Citations

Mar 16, 2019·Evolution; International Journal of Organic Evolution·Marie VoillemotJohn R Pannell
Sep 25, 2019·Plant Biology·M BartošJ Jersáková
Jun 5, 2019·Journal of Evolutionary Biology·Isabel C Caballero, Charles D Criscione

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Methods Mentioned

BETA
dissections

Software Mentioned

multcomp
R Core Team
lmerTest
R
lme4

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